I was just going to comment that if you have to circular mill then the
initial use of a drill might be faster and safer.
Dave
On 4/14/20 4:03 PM, John Dammeyer wrote:
So if I don't have a center cutting end mill then it's probably a good idea to
drill a hole so that the overlap criteria can be met? I guess plan the hole in
the CNC part drawing?
-----Original Message-----
From: dave engvall [mailto:dengv...@charter.net]
Sent: April-14-20 11:37 AM
To: emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Non-circular boring. Linuxcnc style.
I've never had much luck with plunging end mills full dia. Probably
works better with HSS , not so brittle. However, I plunge cut at 40%
overlap and 15 - 18 ipm at 2200 with .25 carbide. Get fair life doing
that. On the same rather flexible mill using a 1/2" rougher I'm good for
.1" radial cuts. That works well when they overlap as in really rough
profiling. In general I'm working with 1018 crs or A36.� Doing full dia
plunge cuts it is easy to run out of stiffness and power with a 1 hp
belt-driven spindle.
I still have hopes of getting the Mazak operational again and that will
be a game changer.
Dave
On 4/14/20 10:55 AM, Sam Sokolik wrote:
we have various forms of these type calculators that seem to work well
https://www.ebay.com/itm/Vintage-Valenite-SPEED-AND-FEED-CALCULATOR-1981-Datailzer-Slide-
Charts/164146745960?hash=item2637e89268:g:V~oAAOSwIGleb93M
On Tue, Apr 14, 2020 at 12:50 PM John Dammeyer <jo...@autoartisans.com>
wrote:
Thanks. The last bit of LinuxCNC milling with a 6mm carbide plunging into
HRS broke two of them. I'm really not doing this right yet. So any
examples of feeds, speeds and coolant are really helpful.
John Dammeyer
-----Original Message-----
From: Sam Sokolik [mailto:samco...@gmail.com]
Sent: April-14-20 10:38 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Non-circular boring. Linuxcnc style.
sorry - forgot a few things.. The mill was a resharpened at about .47".
(why it took 2 tries to get the size where I wanted it) the timing gear
was aluminum.
On Tue, Apr 14, 2020 at 12:26 PM Ed <ate...@mwt.net> wrote:
On 4/14/20 9:53 AM, Sam Sokolik wrote:
now to upgrade the spindle encoder...
https://youtu.be/VmWeXS6y-lg
On Fri, Apr 10, 2020 at 9:00 PM andy pugh <bodge...@gmail.com>
wrote:
On Sat, 11 Apr 2020 at 02:50, Ed <ate...@mwt.net> wrote:
I'm thinking gear hobs or single cutters.
I have been thinking of making gear hobs this way for a while. What
holds me back is that I am not sure that I know how to heat treat
the
hob to a state that will cut the materials that I want to make gears
out of.
--
Heat treating D2 is not a problem here and would work well if a little
slower than M2 high speed. A higher temp furnace is in the plans. I
keep
some D2 on hand.
I am being pushed by a couple customers to get my horizontal/hobbing
machine finished and that will be able to do this kind of work. Soon I
will be paging Andy to help with the setup. :-)
Ed.
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